Having bought the Cooler Master HAF 932 case, my "old" motherboard P5KPL / EPU lacked USB ports. I took this card as perfectly compatible with Windows 8.1. Simple to install, attention to hardware conflicts, flow rates achieved are correct: 18-19 / Mo read and writing test with usb hard drives 3 different brands, with little impact on the processor. I had to release an IRQ to avoid a conflict with the sound card, my PC is connected to my TV via HDMI, and the whole rolls without problem.
Product I recommend!
My configuration is an Intel Core2Quad Q9550S 4x2.83 Ghz, Noctua NH-U12P SE2, 4GB DDR2 Kingston, NVIDIA GTX 780 3GB HDD 4x1 TB of 32MB Samsung brand cache, 1 DVD player, 1 reader- DVD burner, 1 external reader-writer Blu Ray, powered by a 850 Cooler Master Silent Pro M850. Not all young but did the trick!